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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd1754a4808fb785ebab16506b058066741b35d0763d508e43df199bc78aa55' 
  AND token = 'hQ7iA1zHP7ABQ896SR+//OJ9wd1bjUi/9JeJmXsqE38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}